← External Forces: Climate & Resource (all topics)
Backing down / flexibilisation
What it is
Backing down is reducing thermal output when cheaper renewable generation is available; flexibilisation is retrofitting plants to ramp faster and operate stably at lower minimum load - typically down to 40% from 55%
As solar share rises, thermal increasingly runs as a balancing resource rather than at base load
Impact on industries
- Cycling degrades equipment - thermal stress on boilers and turbines raises maintenance cost and shortens component life
- Lower plant load factors spread fixed costs over fewer units, worsening per-unit economics even where capacity charges are recovered
- Flexibility is becoming a saleable service, and generators able to ramp fast are better placed as ancillary markets develop
- Under regulated PPAs, availability-based capacity charges cushion the revenue impact of being backed down
- It marks the structural role change for coal - from supplying energy to supplying firm capacity and flexibility